Fluke_calibration_manual-187_189_cmeng0100

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187/189True RMS Multimeter

Calibration Manual

PN 1584337

November 2000 Rev.1, 6/02

2000-2002 Fluke Corporation. All rights reserved. Printed in U.S.A.All product names are trademarks of their respective companies.


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LIFETIME LIMITED WARRANTY

Each Fluke 20, 70, 80, 170 and 180 Series DMM will be free from defects in material and workmanship for its lifetime. As

used herein, lifetime is defined as seven years after Fluke discontinues manufacturing the product, but the warranty period

shall be at least ten years from the date of purchase. This warranty does not cover fuses, disposable batteries, damage

from neglect, misuse, contamination, alteration, accident or abnormal conditions of operation or handling, including failures

caused by use outside of the products specifications, or normal wear and tear of mechanical components. This warrantycovers the original purchaser only and is not transferable.

For ten years from the date of purchase, this warranty also covers the LCD. Thereafter, for the lifetime of the DMM, Fluke

will replace the LCD for a fee based on then current component acquisition costs.

To establish original ownership and prove date of purchase, please complete and return the registration card

accompanying the product, or register your product onhttp://www.fluke.com. Fluke will, at its option, repair at no charge,

replace or refund the purchase price of a defective product purchased through a Fluke authorized sales outlet and at the

applicable international price. Fluke reserves the right to charge for importation costs of repair/replacement parts if the

product purchased in one country is sent for repair elsewhere.

If the product is defective, contact your nearest Fluke authorized service center to obtain return authorization information,

then send the product to that service center, with a description of the difficulty, postage and insurance prepaid (FOBDestination). Fluke assumes no risk for damage in transit. Fluke will pay return transportation for product repaired or

replaced in-warranty. Before making any non-warranty repair, Fluke will estimate cost and obtain authorization, then

invoice you for repair and return transportation.

THIS WARRANTY IS YOUR ONLY REMEDY. NO OTHER WARRANTIES, SUCH AS FITNESS FOR A PARTICULAR

PURPOSE, ARE EXPRESSED OR IMPLIED. FLUKE SHALL NOT BE LIABLE FOR ANY SPECIAL, INDIRECT,

INCIDENTAL OR CONSEQUENTIAL DAMAGES OR LOSSES, INCLUDING LOSS OF DATA, ARISING FROM ANY

CAUSE OR THEORY. AUTHORIZED RESELLERS ARE NOT AUTHORIZED TO EXTEND ANY DIFFERENT

WARRANTY ON FLUKES BEHALF. Since some states do not allow the exclusion or limitation of an implied warranty or

of incidental or consequential damages, this limitation of liability may not apply to you. If any provision of this warranty is

held invalid or unenforceable by a court or other decision-maker of competent jurisdiction, such holding will not affect the

validity or enforceability of any other provision.

Fluke Corporation Fluke Europe B.V.P.O. Box 9090 P.O. Box 1186Everett, WA 98206-9090 5602 BD EindhovenU.S.A. The Netherlands

2/02
http://www.fluke.com/http://www.fluke.com/http://www.fluke.com/http://www.fluke.com/http://www.fluke.com/


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i

Table of Contents

Title Page

Introduction ....................................................................................................... 1Contacting Fluke ............................................................................................... 1Precautions and Safety Information .................................................................. 2International Symbols........................................................................................ 2Safety Information............................................................................................. 3Specifications .................................................................................................... 4

Accuracy ....................................................................................................... 4Feature Summary .......................................................................................... 4

Basic Specifications .......................................................................................... 5Detailed Accuracy Specifications ..................................................................... 6Frequency Counter Sensitivity .......................................................................... 9Burden Voltage (A, mA, A)............................................................................ 9

Input Characteristics.......................................................................................... 9Required Equipment.......................................................................................... 10Basic Maintenance ............................................................................................ 11

Opening the Meter Case................................................................................ 11Removing and Reinserting the Circuit Board Assembly.............................. 11Replacing the LCD........................................................................................ 12Reassembling the Meter Case ....................................................................... 13Testing Fuses (F1 and F2)............................................................................. 13Replacing Fuses ............................................................................................ 14Replacing the Batteries ................................................................................. 14Cleaning ........................................................................................................ 15

Performance Tests ............................................................................................. 16Testing the Display ....................................................................................... 16

Backlight Test ............................................................................................... 16Current Terminal Sensing Test ..................................................................... 16Keypad Test .................................................................................................. 17Verification of the IR Communication Port.................................................. 17Testing Temperature ..................................................................................... 17Testing Voltage, Current, Resistance, Capacitance and Diode Functions.... 18

Calibration......................................................................................................... 21Keypad Interface ........................................................................................... 21General Procedure......................................................................................... 22Special Requirements.................................................................................... 23Calibration Inputs.......................................................................................... 23


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187/189Calibration Manual

ii

Remote Interface ........................................................................................... 25Temperature Calibration ............................................................................... 25

Setup ......................................................................................................... 25Procedure .................................................................................................. 26

Re-Programming Serial Number or Model Number..................................... 26Parts and Accessories ........................................................................................ 27


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iii

List of Tables

Table Title Page

1. International Symbols............................................................................................ 22. Required Tools and Equipment ............................................................................. 103. Temperature Test Input and Display ..................................................................... 174. Performance Test Steps ......................................................................................... 185. Calibration Inputs .................................................................................................. 23


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iv


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v

List of Figures

Figure Title Page

1. Removing LCD Mask to Access LCD................................................................... 122. Testing the Current Fuses...................................................................................... 143. Battery and Fuse Replacement .............................................................................. 154. Display Test........................................................................................................... 165. Locating Recessed Calibration Button .................................................................. 216. Calibration Display................................................................................................ 227. Replacement Parts and Accessories....................................................................... 28


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vi


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1

Introduction

WWarning

To avoid shock or injury, do not perform the verification testsor calibration procedures described in this manual unless youare qualified to do so.

The information provided in this document is for the use ofqualified personnel only.

Caution

The 187 & 189 Multimeters contain parts that can be damaged

by static discharge.

Follow the standard practices for handling static sensitivedevices.

The information in this manual deals with the Fluke Models 187 & 189 True RMSMultimeters, (hereafter referred to as the meter). Information provided includes:

Precautions and safety information

Specifications

Basic maintenance (cleaning, replacing the battery and fuses)

Performance test procedures

Calibration and calibration adjustment procedures

Accessories and replaceable partsFor complete operating instructions, refer to the Model 187 & 189 Users Manual locatedon the 187/189 CD ROM.

Contacting FlukeTo order accessories, receive assistance, or locate the nearest Fluke distributor or ServiceCenter, call:

USA: 1-888-99-FLUKE (1-888-993-5853)Canada: 1-800-36-FLUKE (1-800-363-5853)Europe: +31 402-678-200Japan: +81-3-3434-0181

Singapore: +65-738-5655Anywhere in the world: +1-425-446-5500

Address correspondence to:

Fluke Corporation Fluke Europe B.V.P.O. Box 9090, P.O. Box 1186,Everett, WA 98206-9090 5602 BD EindhovenUSA The Netherlands

Visit us on the World Wide Web at:www.fluke.com
http://www.fluke.com/http://www.fluke.com/http://www.fluke.com/


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11/36

True RMS MultimeterSafety Information

3

Safety Information

WWarnings and Precautions

To avoid possible electric shock or personal injury, follow these guidelines:

Do not use the Meter if it is damaged. Before you use the Meter, inspect the case.Look for cracks or missing plastic. Pay particular attention to the insulationsurrounding the connectors.

Inspect the test leads for damaged insulation or exposed metal. Check the testleads for continuity. Replace damaged test leads before you use the Meter.

Do not use the Meter if it operates abnormally. Protection may be impaired. Whenin doubt, have the Meter serviced.

Do not operate the Meter around explosive gas, vapor, or dust.

Do not apply more than the rated voltage, as marked on the Meter, betweenterminals or between any terminal and earth ground.

Before use, verify the Meters operation by measuring a known voltage.

When measuring current, turn off circuit power before connecting the Meter in the

circuit. Remember to place the Meter in series with the circuit.

When servicing the Meter, use only specified replacement parts.

Use caution when working above 30 V ac rms, 42 V peak, or 60 V dc. Such

voltages pose a shock hazard.

Avoid working alone.

When using the probes, keep your fingers behind the finger guards on the probes.

Connect the common test lead before you connect the live test lead. When you

disconnect test leads, disconnect the live test lead first.

Remove test leads from the Meter before you open the battery door.

Do not operate the Meter with the battery door or portions of the cover removed or

loosened.

To avoid false readings, which could lead to possible electric shock or personal

injury, replace the batteries as soon as the low battery indicator (M) appears.

Use only type AA batteries, properly installed in the Meter case, to power the

Meter.

Caution

To avoid possible damage to the Meter or to the equipment under test, follow these

guidelines: Disconnect circuit power and discharge all high-voltage capacitors before testing

resistance, continuity, diodes, or capacitance.

Use the proper terminals, function, and range for your measurements.

Before measuring current, check the Meter's fuses and turn power OFF to thecircuit before connecting the Meter to the circuit.


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4

Specifications

Accuracy

Accuracy is specified for a period of one year after calibration, at 18 C to 28 C (64 Fto 82 F), with relative humidity to 90 %. Accuracy specifications are given as:

( [ % of reading ] + [ number of least significant digits ] )

AC mV, AC V, AC A, AC mA, and AC A specifications are ac-coupled, true rms and arevalid from 5 % of range to 100 % of range. AC crest factor can be up to 3.0 at full-scale, 6.0at half-scale, except the 3000 mV and 1000 V ranges where it is 1.5 at full scale, 3.0 at half-scale.

Feature Summary

Feature Description

Dual Digital Displays

Analog Bar Graph

Primary: 50,000 counts

Secondary: 5,000 count

Bar graph: 51 segments, updates 40 times/second

Backlight with 2 brightness levels Bright white backlight for clear readings in poorly lighted areas

Fast Autorange Meter automatically selects best range - instantly

AC+DC true rms, ac rms specified

to 100 kHz

Choices for AC only, AC and DC dual display, or AC+DC

readings

dBm, dBV User selectable impedance references for dBm

AutoHOLD Holds readings on display

Continuity / Open test Beeper sounds for resistance readings below threshold, or to

indicate a momentary open circuit

Fast Bar Graph 51 segments for peaking and nulling

Duty cycle / Pulse width Measure signal on or off time in % or milliseconds

MIN MAX Mode

FAST MN MX with 24-hour time

stamp

Record maximum, minimum, and average values.

24-hour clock for MAX or MIN, elapsed time for AVG.

FAST MN MX captures peaks to 250 sec.

Closed-Case Calibration No internal adjustments needed

Battery / Fuse Access Door Battery or fuse replaceable without voiding calibration

Hi-Impact Overmolded Case Protective holster features


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True RMS MultimeterBasic Specifications

5

Basic SpecificationsFunction Ranges/Description

DC Voltage 0 to 1000 V

AC Voltage, true RMS 2.5 mV to 1000 V 100 kHz bandwidth

Basic Accuracy DC voltage: 0.025 %AC voltage: 0.4 %

DC Current 0 to 10 A (20 A for 30 seconds)

AC Current, true RMS 25 A to 10 A (20 A for 30 seconds)

Resistance 0 to 500 M

Conductance 0 to 500 nS

Capacitance 0.001 nF to 50 mF

Diode Test 3.1 V

Temperature 200 C to 1350 C (328 F to 2462 F)

Frequency 0.5 Hz to 1000 kHz

LOGGING Intervals

(Model 189 only)

At least 288 intervals may be stored. Up to 700 unstable event values (seeAutoHold) are automatically added to LOGGING memory for viewing onlythrough optional PC software. Additional intervals will be logged up to 995 ifthe signal is stable.

SAVE Readings

(Model 189 only)

Up to 100 readings may be saved by the user in a memory separate fromLOGGING memory. These readings may be viewed using VIEW MEM.


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6

Detailed Accuracy SpecificationsAccuracy is specified for a period of one year after calibration, at 18 C to 28 C (64 Fto 82 F), with relative humidity to 90 %. Accuracy specifications are given as:

( [ % of reading ] + [ number of least significant digits ] )AC mV, AC V, AC A, AC mA, and AC A specifications are ac coupled, true rms and

are valid from 5 % of range to100 % of range. AC crest factor can be up to 3.0 at full-scale, 6.0 at half-scale except the3000 mV and 1000 V ranges where it is 1.5 at full scale, 3.0 at half-scale.

Accuracy

Function Range Resolution

45 Hz-

1 kHz

20 Hz-

45 Hz

1 kHz-

10 kHz

10 kHz-

20 kHz

20 kHz-

100 kHz

AC mV1, 2

50.000 mV 0.001 mV 0.4 % + 40 2 % + 80 5 % + 40 5.5 % + 40 15 % + 40

500.00 mV 0.01 mV 0.4 % + 40 2 % + 80 5 % + 40 5.5 % + 40 8 % + 40

3000.0 mV 0.1 mV 0.4 % + 40 2 % + 80 0.4 % + 40 1.5 % + 40 8 % + 40

AC V1, 2

5.0000 V 0.0001 V 0.4 % + 40 2 % + 80 0.4 % + 40 1.5 % + 40 8 % + 40

50.000 V 0.001 V 0.4 % + 40 2 % + 80 0.4 % + 40 1.5 % + 40 8 % + 40

500.00 V 0.01 V 0.4 % + 40 2 % + 80 0.4 % + 40 Not

specified

Not

specified

1000.0 V 0.1 V 0.4 % + 40 2 % + 80 0.4 % + 40 Not

specified

Not

specified

dBV 52 to 6 0.01 dB 0.1 dB 0.2 dB 0.5 dB 0.5 dB 1.4 dB

6 to +34 0.01 dB 0.1 dB 0.2 dB 0.1 dB 0.2 dB 0.8 dB

+34 to +60 0.01 dB 0.1 dB 0.2 dB 0.1 dB Not

specified

Not

specified

1. For the 5,000 count mode, divide the number of least significant digits (counts) by 10.

2. A residual reading of 8 to 180 digits with leads shorted, will not affect stated accuracy above 5 % of range.

Accuracy

Function Range Resolution

45 Hz-

1 kHz

20 Hz-

45 Hz

1 kHz-

20 kHz

20 kHz-

100 kHz

AC A 500.00 A 0.01 A 0.75 % + 20 1 % + 20 0.75 % + 20 6 % + 40

5,000.0 A 0.1 A 0.75 % + 5 1% + 5 0.75 % + 10 2 % + 40

AC mA 50.000 mA 0.001 mA 0.75 % + 20 1% + 20 0.75 % + 20 9 % + 40

400.00 mA 0.01 mA 0.75 % + 5 1% + 5 1.5 % + 10 4 % + 40

AC A 5.0000 A 0.0001 A 1.5 % + 20 1.5% + 20 6 % + 40 Not specified

10.000 A1

0.001 A 1.5 % + 5 1.5% + 5 5 % + 10 Not specified

1. 10 A continuous up to 35 C, less than 10 minutes 35 C to 55 C. 20 A overload for 30 seconds maximum.


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True RMS MultimeterDetailed Accuracy Specifications

7

Accuracy Accuracy Dual Display AC or AC+DC3

Function Range Resolution DC

20 Hz-

45 Hz

45 Hz -

1 kHz

1 kHz-

20 kHz

DC mV 50.000 mV 0.001 mV 0.1% + 20 6 % + 40

500.00 mV 0.01 mV 0.03 % + 2

3000.0 mV 0.1 mV 0.025 % + 5 2 % + 40

DC V 5.0000 V 0.0001 V 0.025 % + 102

50.000 V 0.001 V 0.03 % + 32

500.00 V 0.01 V 0.1 % + 22

Not specified

1000.0 V 0.1 V 0.1 % + 22

2 % + 80 0.5 % + 40

Not specified

DC A 500.00 A 0.01 A 0.25 % + 20 1 % + 20 1.0 % + 20 2 % + 40

5,000 A 0.1 A 0.25 % + 2 1 % + 10 0.75 % + 10 2 % + 40

DC mA 50.000 mA 0.001 mA 0.15 % + 10 1 % + 20 0.75 % + 20 2 % + 40

400.00 mA 0.01 mA 0.15 % + 2 1 % + 10 1 % + 10 3 % + 40

DC A 5.0000 A 0.0001 A 0.5 %+ 10 2 % + 20 2 % + 20 6 % + 4010.000 A

10.001 A 0.5 %+ 2 1.5 % + 10 1.5 % + 10 5 % + 10

1. 10 A continuous up to 35 C, less than 10 minutes 35 C to 55 C. 20 A overload for 30 seconds maximum.2. 20 counts in dual display DC or AC+DC.3. See AC conversions notes for AC mV and V

Function Range Resolution Accuracy

Resistance1

500.00 0.01 0.05 % + 103

5.0000 k 0.0001 k 0.05 % + 2

50.000 k 0.001 k 0.05 % + 2

500.00 k 0.01 k 0.05 % + 25.0000 M 0.0001 M 0.15 % + 4

2

30.000 M 0.001 M 1 % + 42

100.0 M 0.1 M 3 % + 24

500.0 M 0.1 M 10 % + 24

Conductance 50.00 nS 0.01 nS 1 % + 10

1. For the 5,000 count mode, divide the number of least significant digits (counts) by 10.2. For relative humidity greater than 70 %, resistance accuracy is 0.5 % over 1 M and 2.5 % over 10 M.3. Using relative mode (REL ) to zero residual reading.4. To ensure stated accuracy, switch to conductance mode and verify that the open circuit reading is less than

0.10 nS.


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8

Function Ranges Resolution Accuracy

Capacitance2

1.000 nF 0.001 nF 2% + 5

10.00 nF 0.01 nF 1 % + 5

100.0 nF 0.1 nF

1.000 F 0.001 F

10.00 F 0.01 F

100.0 F 0.1 F

1,000 F 1 F

10.0 mF 0.01 mF

50.00 mF 0.01 mF 3 3 % + 10

Diode Test 1 3.1000 V 0.0001 V 2 % + 20

1. For the 5,000 count mode, divide the number of least significant digits (counts) by 10.

2. For film capacitor or better, using Relative mode (REL ) to zero residual on 1.000 nF and 10.00 nF ranges.

3. Least significant digit not active above 10 mF.

Function Range Resolution Accuracy

Frequency 500.00 Hz 0.01 Hz 1 (0.0050 % + 1)

5.0000 kHz 0.0001 kHz

50.000 kHz 0.001 kHz

999.99 kHz 0.01 kHz

Duty Cycle 10.00% to 90.00 % 0.01 % ((voltage range/input voltage) X 300counts) 5,6

Pulse Width 499.99 ms 0.01 ms (3 % X (voltage range/input voltage) + 1count) 5,6

999.9 ms 0.1 ms

Temperature 200 to +1350 C 0.1 C ( 1% of reading + 1 C) 2,3

328 to +2462 F 0.1 F ( 1% of reading + 1.8 F) 2,3

MIN MAXAVG

Response: 100 ms to 80 % Specified accuracy 12 counts forchanges > 200 ms in duration. ( 40counts in AC for changes > 350 ms andinputs > 25 % of range)

FAST MN MX 250 s 4 Specified accuracy 100 counts up to5,000 count (full range) reading. For higherpeak readings (to 20,000 counts),specified accuracy 2% of reading.

1. Reading will be 0.00 for signals below 0.5 Hz.

2. Accuracy specification is relative to the user-adjustable temperature offset, and assumes ambient temperaturestable to 1 C.

3. For ambient temperature changes of 5 C, rated accuracy applies after 1 hour.

4. For repetitive peaks; 2.5 ms for single events. Use DC function settings below 20 Hz. 50 mV range not specified.5. Frequency greater than 5 Hz, except for VDC, 500 mVDC and 3000 mVDC functions; 0.5 Hz to 1 kHz. Signals

centered around trigger levels.

6. Range/input ratios also apply to current functions. 500 counts or 5 % for 10 A ranges.


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True RMS MultimeterFrequency Counter Sensitivity

9

Frequency Counter SensitivityApproximate VAC

Sensitivity (RMS SineWave)

1

InputRange

15 Hz -100 kHz

2500 kHz

2

VACBandwidth

3

ApproximateVDC Trigger

Levels1

VDC Bandwidth3

50 mV 5 mV 10 mV 1 MHz -5 mV & 5 mV 1 MHz

500 mV 20 mV 20 mV 1 MHz 5 mV & 65 mV 1 MHz

3000 mV 500 mV 2000 mV 800 kHz 140 mV & 200 mV 90 kHz

5 V 0.5 V 2.0 V 950 kHz 1.4 V & 2.0 V 14 kHz

50 V 5 V 5.0 V 1 MHz 0.5 V & 6.5 V > 400 kHz

500 V 20 V 20 V 1 MHz 5 V & 65 V > 400 kHz

1000 V 100 V 100 V > 400 kHz 5 V & 65 V > 400 kHz

1. Maximum input = 10 x Range (1000 V max). Noise at low frequencies and amplitudes may affect accuracy.

2. Useable at reduced sensitivity to 0.5 Hz and 1000 kHz.

3. Typical frequency bandwidth with full scale (or maximum 2 X 107 V-Hz product) RMS sine wave.

Burden Voltage (A, mA, A)Function Range Burden Voltage (typical)

mA - A 500.00 A 102 V /A

5,000 A 102 V /A

50.000 mA 1.8 mV / mA

400.00 mA 1.8 mV / mA

A 5.0000 A 0.04 V / A

10.000 A 0.04 V / A

Input CharacteristicsFunction Input Impedance (Nominal)

Volts, mV 10 M, < 100 pF

Common Mode Rejection Ratio Normal Mode Rejection

DC Volts, mV >100 dB at dc, 50 Hz or 60 Hz 0.1% >90 dB at 50 Hz or 60 Hz 0.1%

AC Volts, mV > 90 dB dc to 60 Hz

Full-Scale Voltage

Open Circuit Test Voltage To 5 M 30 M + nS

Ohms < 5 V 500 mV 3.1 V

Diode Test < 5 V 3.1000 V

Typical Short-Circuit Current

500 5 k 50 k 500 k 5 M 30 M

Ohms 1 mA 100A 10A 1A 0.1A 0.1A

Diode Test 1 mA typical


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10

Required EquipmentRequired equipment is listed in Table 2. If the recommended models are not available,equipment with equivalent specifications may be used.

Repairs or servicing should be performed only by qualified personnel.

Table 2. Required Equipment

Equipment Required CharacteristicsRecommended

Model

Calibrator AC Voltage Range: 0-1000 Vac

Accuracy: + 0.1 %

Frequency Range: 20 Hz 100 kHzAccuracy: +3 %

DC Voltage Range: 0-1000 Vdc

Accuracy: + 0.006 %

Current Range: 0-10A

Accuracy: AC mA - +0.18 %AC A - + 0.38 %

Frequency range: 1 kHz 20 kHzDC mA - + 0.06 %DC A - + 0.125 %

Frequency Source: 500 Hz-20 kHz

Accuracy: + 0.00125 %Amplitude: 1 VoltAccuracy: + 5 %

Ohms Range: 0 - 50 MAccuracy: + 0.0125 %

Capacitance Range: 110.0 nF & 11.00FAccuracy: +0.25%

Temperature Range: -10 to 350 CAccuracy: 0.3%

Fluke 5520A

Thermocouple AdapterAccessory

K-type Fluke 80AK

K-type Thermocouple K-type, mini-plug on both ends N/A

Serial Cable, Infrared/W IRCable Adapter

Fluke P/N 1590638

87/89-IV, 187/189Service Software

Fluke P/N 676152


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True RMS MultimeterBasic Maintenance

11

Basic Maintenance

WWarning

To avoid electrical shock or personal injury, remove the testleads and any input signals before opening the case or

replacing the battery or fuses. To prevent damage or injury,install ONLY batteries or fuses specified for this product.

Opening the Meter Case

Caution

To avoid unintended circuit shorting, always place theuncovered Meter assembly on a protective surface. When thecase of the Meter is open, circuit connections are exposed.

To open the Meter case, do the following:

1. Disconnect test leads from any live source, turn the rotary switch to OFF, andremove the test leads from the front terminals.

2. Remove the battery door by using a flat-blade screwdriver to turn the battery doorfasteners 1/4-turn counterclockwise.

3. The case bottom is secured to the case top by four screws, one at each corner.Remove the screws with a Phillips-head screwdriver.

4. Pull the two halves of the case apart.

Removing and Reinserting the Circuit Board Assembly

The circuit board assembly must be removed to access and replace the LCD.

Caution

The circuit board is extremely susceptible to contamination.Handle it by the input receptacle, fuse clips or edges of theboard only. You can use clean surgical gloves to help avoidcontamination.

1. Open the Meter case and remove the case bottom to access the circuit board.

2. Remove the two Phillips-head screws securing the circuit board to the case top andlift it out carefully to avoid contamination.

3. To reinsert the circuit board, simply place it into the case top with the LCD displayshowing through the window.

4. Carefully replace the two Phillips-head screws that connect the circuit board to thecase top.

Caution

Do not over-torque the two Phillips-head screws when youreconnect the circuit board to the case top. Doing so maycreate shielding problems and cause the Meter to give incorrectreadings.


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12

Replacing the LCD

If you need to replace the LCD, you will find it easier to leave the LCD assemblyattached to the circuit board and access the LCD by removing the LCD mask from thefront of the LCD assembly.

1. Remove the circuit board as described under Removing and Reinserting the Circuit

Board Assembly.

2. Carefully insert the tip of a thin screwdriver under the LCD mask at the top of thedisplay as shown in Figure 1.

LCD

LCD Mask

aau05f.eps

Figure 1. Removing LCD Mask to Access LCD

3. Lift up the LCD mask gently with the screwdriver blade to loosen the mask from theassembly. Be careful to press upward, not inward toward the LCD. By hand, tilt theLCD mask upward to release.

4. Replace the LCD. The LCD must be centered on the platform between the brackets

before you replace the LCD mask. If the LCD is improperly aligned, the display mayshow missing segments or meaningless readings.

5. Reattach the LCD mask by pressing it over the LCD until it snaps into place.


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13

Reassembling the Meter Case

To reassemble the Meter case, do the following:

1. Verify that the rotary switch is in the OFF position.

2. Reinsert the circuit board by placing it into the case top with the LCD showing

through the window. Carefully replace the two Phillips-head screws that connect thecircuit board to the case top.

Caution

Do not over-torque the two Phillips-head screws when youreconnect the circuit board to the case top. Doing so maycreate shielding problems and cause the Meter to give incorrectreadings.

3. Hold the Meter face down and place the case bottom on the case top. Make sure thebacklight cable located on the back of the LCD assembly is not caught between thecase halves.

4. Reinstall the four screws and the battery door.

5. Secure the battery door by turning the fasteners 1/4-turn clockwise.

6. Go to the Performance Test section in this document, and perform the proceduresdescribed.

Testing Fuses (F1 and F2)

Before measuring current, test the appropriate fuse as shown in Figure 2. If the tests givereadings other than those shown, have the Meter serviced.

WWarning

To avoid electrical shock or personal injury, remove the testleads and any input signals before replacing the battery or

fuses. To prevent damage or injury, install ONLY specifiedreplacement fuses with the amperage, voltage, and speedratings shown in the specifications.


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14

1000V

400mAFUSED

10AMAXFUSED

CAT

MINMAX

HOLD

REL

%msHz

RANGE

dB

dB

ac+dc

ac+dc

ac+dc

ac+dc

F

nS

mA

mAA

mVV

mV

V

OFF

C

A

A

A

A

mA

COM

V

TEMPERATURE

A

ac+dc

AutoHOLD

LOGGING

SAVE

CANCEL

FASTMNMX

YES

NO

CLEARMEM

VIEW

SETUP

1000V

400mAFUSED

10AMAXFUSED

CAT

LOGGINGMULTIMETER

189

MINMAX

HOLD

REL

%msHz

RANGE

dB

dB

ac+dc

ac+dc

ac+dc

ac+dc

F

nS

mA

mAA

mVV

mV

V

OFF

C

A

A

A

A

mA

COM

V

TEMPERATURE

A

ac+dc

AutoHOLD

LOGGING

SAVE

CANCEL

FASTMNMX

YES

NO

CLEARMEM

VIEW

SETUP

mAA

mAA

Replace F2 if " or "displayed

Replace F1 if " or "displayed

LOGGINGMULTIMETER

189

ach038f.eps

Figure 2. Testing the Current Fuses

Replacing Fuses

WWarning

To avoid electrical shock, remove the test leads and any inputsignals before replacing the battery or fuses. To prevent damage orinjury, INSTALL ONLY specified fuses and batteries.

To replace the fuses, refer to Figure 3 and do the following:

1. Turn the rotary switch to OFF and remove the test leads from the terminals

2. Remove the battery access door by using a standard-blade screwdriver to turn thebattery door fasteners one-quarter turn counterclockwise.

3. Remove either fuse by gently prying one end loose, then lifting the fuse out of thefuse contacts.

4. Install ONLY specified fuses.

5. Reinstall the battery door. Secure the door by turning the fasteners one-quarter turnclockwise.

Replacing the Batteries

The Meter is powered by four AA batteries (NEDA 15A or IEC LR6).

Caution

Be sure to observe proper polarity when replacing batteries.Incorrect battery polarity may seriously damage the Meter.


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15

To replace the batteries, refer to Figure 3 and do the following:

1. Turn the rotary switch to OFF and remove the test leads from the terminals.

2. Remove the battery door by using a standard-blade screwdriver to the turn thebattery door fasteners one-quarter turn counterclockwise.

3. Replace the batteries, observing proper polarity. Replace the battery door and secureit by turning the fasteners one-quarter turn clockwise.

F2

F1

tc037f.eps

Figure 3. Battery and Fuse Replacement

Cleaning

WWarning

To avoid electrical shock or damage to the Meter, never allowwater inside the case. To avoid damaging the housing, neverapply solvents to the Meter.

Periodically wipe the case with a damp cloth and mild detergent. Do not use abrasives orsolvents.

Dirt or moisture in the input terminals can affect readings and can falsely activate theInput Alert feature. Clean the terminals as follows:

1. Turn the Meter off and remove all test leads.

2. Shake out any dirt that may be in terminals.

3. Soak a new swab with alcohol. Clean each terminal with the swab.


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16

Performance TestsThe following performance tests will ensure that the Meter is in proper operatingcondition and will check the accuracy of each meter function against its specifications.To perform the tests you will need a Fluke 5520A Calibrator or equipment meeting theminimum specification given in Table 1.

If the Meter fails any of these tests, it needs calibration adjustment or repair.

Testing the Display

Push down theQ button and simultaneously turn the Meter on. Compare the displaywith the example in Figure 4. Check all segments for clarity and contrast.

aau02f.eps

Figure 4. Display Test

Backlight Test

To test the backlight, press theT button twice. Note that the backlight comes on at twodifferent intensity levels.

Current Terminal Sensing Test

This test determines whether or not the Input Alert beeper is functioning properly.

Note

Before conducting this test, make sure the beeper is not disabled in setup.

1. Turn the rotary switch to the AC V function. Press the backlight button twice to turnthe backlight to the highest intensity.

2. Turn the rotary switch to all functions, except current functions. Note that the beeperdoes not come on.

3. Turn the rotary switch to the DC mA position. Insert a test lead into the mAterminal. Note that the beeper does not emit a continuous chirp.

Note

As the test lead is inserted, the Meter may produce a single chirp. This isacceptable.


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True RMS MultimeterPerformance Tests

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Keypad Test

To test the keypad, turn the Meter to AC V and push each button separately. Each buttonpush should cause the Meter to beep.

Reset the Meter by turning it Off, and then backOn.

Verification of the IR Communication Port

Note

If you are using MET/CAL to do performance testing, it is not necessary toperform this verification test.

1. Connect the Infrared Serial Cable to the com port of a PC.

2. Connect the Infrared Serial Cable to the IR Cable Adapter and insert into the187/189 accessory mount so that it is flush with the IR adapter window. Turn theMeter rotary switch to DC V.

3. Install Fluke 87/89-IV, 187/189 Service Software, P/N 676152.

4. Apply 1 V dc to the VeG terminal.5. The display reading should appear in text box of PC.

Note

If the PC indicates that the Meter is not connected, ensure that the comport is correct and that the IR Serial Cable and adapter is aligned with theIR window.

Testing Temperature

Connect K-type thermocouple and Fluke 80Ak to the temperature input on the Meter.Connect the other end to the 5520A TC output. Allow connections to stabilize for 30seconds before proceeding.

1. Turn the rotary switch to the temperature function.

2. Set the 5520A for K-type thermocouple and an output of 23 C.

3. Enter the Meter Setup mode (press yellow button, then backlight button).

4. Adjust the temperature offset until the temperature on the Meter primary displaymatches the 5520A output temperature (23 C). Use the blue shift button andbacklight button to advance digit. Use the up and down arrow keys to edit digit.

5. Enter an offset value by pressing the yellow button, then the backlight button.

6. Exit Setup mode by pressing the yellow button, then the CANCEL button.

7. Perform the steps in Table 3.

Table 3. Temperature Test Input and Display

DisplayInput

Lower Limit Upper Limit

-10.0 C -11.1 C -8.9 C

0.0 C -1.0 C 1.0 C

350.0 C 345.0 C 355.0 C


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18

Testing Voltage, Current, Resistance, Capacitance and Diode Functions

To verify the accuracy of Meter functions, do the following.

1. Connect the Calibrator to the VeG and COM inputs on the Meter.

2. Turn the rotary switch to the function listed in each step.

3. Apply the input from the steps listed in Table 4.

4. Compare the reading on the Meter display with the display reading in Table 4.

5. If the display reading falls outside of the range shown in Table 4, the Meter does notmeet specification.

6. Repeat steps 2 through 4 for the remaining inputs shown in Table 4.

Table 4. Performance Test Steps

Display2

Step Function Range1

Input Level

Frequency or

ModelLower

Limit

Upper

Limit

1 AC V 5.0000 V 0.25 V 100 kHz 0.2260 0.2740

2 AC V 5.0000 V 5 V 20 kHz 4.9210 5.0790

3 AC V 5.0000 V 5 V 100 kHz 4.5960 5.4040

4 AC V 50.000 V 50 V 700 Hz 49.760 50.240

5 AC V 50.000 V 50 V 20 kHz 49.210 50.790

6 AC V 50.000 V 50 V 100 kHz 45.960 54.040

7 AC V 500.00 V 500 V 65 Hz 497.60 502.40

8 AC V 1000.0 V 500 V 65 Hz 494.0 506.0

9 AC mV 50.000 2.5 mV 100 kHz 2.085 2.915

10 AC mV 50.000 50 mV 20 kHz 47.210 52.79011 AC mV 50.000 50 mV 100 kHz 42.460 57.540

12 AC mV 500.00 mV 500 mV 10 kHz 474.60 525.40

13 AC mV 3000.0 mV 3 V 20 kHz 2951.0 3049.0

14 AC mV 3000.0 mV 3 V 100 kHz 2756.0 3244.0

15 Frequency 50.000 kHz 1 V 20 kHz 19.998 20.002

16 Duty Cycle 3.0000 V 2.2 Vp-p,@30%Sq. wave

500 Hz 21.82 38.18

17 DC V 5.0000 V short -0.0010 0.0010

18 DC V 5.0000 V 5 V 4.9977 5.0023

19 DC V 5.0000 V -5 V -4.9977 -5.0023

20 DC V 50.000 V -50 V -49.982 -50.018

21 DC V 500.00 V -500 V -499.48 -500.52

22 DC V 1000.0 V -500 V -499.3 -500.7

1. Do not rely on autoranging for all tests. Some test steps will require manual ranging.

2. Must allow for source and meter settling before recording reading.

3. Wait at least 60 seconds for source and meter to settle before recording reading.

4. Using Relative Mode (REL) to zero residual reading (apply 0 and allow UUT to settle for 45 seconds before

pushing REL).


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True RMS MultimeterPerformance Tests

19

Table 4. Performance Test Steps (cont.)

Display2


Input Level FrequencyLower

Limit

Upper

Limit

23 AC&DC 50.000 V 50 V 20 kHz 48.960 51.040

24 DC mV 50.000 0 mV3

-0.020 +0.020

25 DC mV 50.000 50 mV 49.930 50.070

26 DC mV 50.000 -50 mV -49.930 -50.070

27 DC mV 500.00 mV 0 V -0.02 0.02

28 DC mV 500.00 mV 500 mV 499.83 500.17

29 DC mV 3000.0 mV +2 V 1999.0 2001.0

30 DC mV 3000.0 mV -3 V -2998.7 -3001.3

31 AC+DC 3000.0 mV 1 V 20 kHz 976.0 1024.0

Connect 5520A for 2 Wire Comp

32 Ohms 500.00 0 4

-0.10 0.1033 Ohms 500.00 500 499.65 500.35

34 Ohms 5.0000 k 5 k 4.9973 5.0027

35 Ohms 50.000 k 50 k 49.973 50.027

36 Ohms 500.00 k 500 k 499.73 500.27

37 Ohms 5.0000 M 5 M 4.9921 5.0079

38 Ohms 30.000 M 30 M 29.696 30.304

39 Ohms 500.0 100 M 89.8 110.2

Remove 2 Wire Comp

40 nS 50.00 nS open -0.10 +0.10

41 nS 50.00 nS 100 M 9.80 10.20

Remove Test Leads from UUT

42 Capacitance 1.100 nF open


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20

Table 4. Performance Test Steps (cont.)

Display2


Input Level

Frequency or

ModelLower

Limit

Upper

Limit

49 AC uA 5000.0 uA 1.5 mA 1 kHz 1488.2 1511.8

50 DC mA 50.000 mA 0 A -0.010 0.010

51 DC mA 50.000 mA 50 mA 49.915 50.085

52 DC mA 50.000 mA -50 mA -49.915 -50.085

53 DC mA 500.00 mA -329.00 mA -328.49 -329.51

54 DC uA 500.00 uA 500 uA 498.55 501.45

55 DC uA -500.00 uA -500 uA -498.55 -501.45

56 DC uA 5000 uA -5 mA -4987.3 -5012.7

57 DC uA 500.00 uA 0 A -0.2 0.2

58 AC A 5.0000 A 250 mA 1 kHz 0.2442 0.2558

59 AC A 5.0000 A 250 mA 20 kHz 0.2310 0.2690

60 DC A 5.0000 A 0 A -0.0010 0.0010

61 DC A 5.0000 A 5 A 4.9740 5.0260

62 DC A -5.0000 A -5 A -4.9740 -5.0260

63 DC A 10.000 A -6 A -5.968 -6.032

64 AC A 10.000 A 6 A 1 kHz 5.905 6.095

1. Do not rely on autoranging for all tests. Some test steps will require manual ranging.

2. Must allow for source and meter settling before recording reading.3. Wait at least 60 seconds for source and meter to settle before recording reading.

4. Using Relative Mode (REL) to zero residual reading (apply 0 and allow UUT to settle for 45 seconds before

pushing REL).


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True RMS MultimeterCalibration

21

CalibrationCalibrate the Meter once a year to ensure that it performs to specifications.

Before you begin the calibration procedure, locate the recessed calibration button on theback of the Meter, underneath the accessory mount. It is inside a small opening covered

by a seal. Carefully puncture the seal with a calibration tool to access the calibrationbutton. See Figure 5.

Calibration Button

aau04f.eps

Figure 5. Locating Recessed Calibration Button

Keypad Interface

To start the calibration procedure, turn the rotary switch to the DC mV position, thenpress and hold the recessed calibration button on the back of the Meter for one second.This places the Meter in calibration mode as shown on the display in Figure 6. The unitwill remain in the calibration mode until the rotary switch is moved to the OFF position.


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22

UP button

moves to the

next stepAutoranging

is disabled

for calibration

Function indicator

Calibration step number Input signal required Calibration mode indicator

aau01f.eps

Figure 6. Calibration Display

General Procedure

A sequence of signal inputs is required for each function that must be calibrated. Thesecondary display shows the required input next to the step number for that function.The primary display shows the value being measured. The measurement is likely to beslightly different from the applied signal, because it may be showing an uncalibratedmeasurement. The general calibration procedure is as follows:

1. Move the rotary switch to the function that you are calibrating.

2. Apply the input signal indicated by the secondary display.

3. Wait for the measurement on the primary display to settle out to its final value.

4. Press the UP button to proceed to the next step. The Meter records a new constant.

5. Repeat steps 2 through 4 until the secondary display shows End. This indicates thatthe calibration procedure for this function is complete. New constants will not berecorded until secondary display shows End.

6. If there are more functions to be calibrated, move the rotary switch to the appropriatefunction, and continue from step one. Otherwise, turn the rotary switch to the OFFposition to exit calibration.

Note

DC mV calibration affects the calibration of ALL functions and AC mVwill affect all AC functions.

If the accuracy of the calibration source is more than approximately15 % from the nominal value required for the cal point, then the factorydefault cal constants will automatically be used instead of source value.In this case, the Meter may not pass the verification test and mayrequire re-calibration.


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23

Special Requirements

DC mV calibration will affect the calibration of all other functions. Therefore, the DCmV function must be calibrated before calibrating any other function. Similarly, AC mVmust be calibrated before any AC function, but after DC mV. The remaining functionsmay be calibrated in any order.

Temperature calibration need only be performed if one of the following components arereplaced during the course of repair: U4 A/D chip, U10 EEPROM, or U100 ReferenceJunction Sensor. Temperature is calibrated by making an external temperaturemeasurement and entering the result into the instrument for calculation of the calibrationconstant. The calibration constant is then stored in calibration memory. This is doneusing the serial interface. See Temperature Calibrationsection.

When you replace the U10 EEPROM, you must also re-enter the serial number andmodel number for the Meter. See Reprogramming Meter Serial Number and ModelNumber section.

Calibration Inputs

Table 5 lists the input values required for each calibration step.

Note

The column indicating time to settle does not include calibrator settlingtime.

Table 5. Calibration Inputs

Step Value Frequency Time to Settle (In Seconds)

DC mV

1 0 mV DC 16

2 50 mV DC 16

3 300 mV DC 7

4 500 mV DC 7

5 3000 mV DC 1

Temperature

1 0 1

AC mV

1 700 mV 700 Hz 7

2 400 mV 700 Hz 7

3 100 mV 700 Hz 7

4 50 mV 700 Hz 7

5 3000 mV 700 Hz 7

1. Use 5520A 2-Wire Comp.

2. Zero ohms must use the same calibrator and test leads as all other ohm cal points.

Do not bypass the calibrator with a shorting bar for the zero ohms step.

3. Because of capacitive coupling, readings will be affected by movement of the leads or

operator. Put fingers on UP button and wait for display reading to settle before pushing.


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24

Table 5. Calibration Inputs (cont.)


AC V

1 5 V 700 Hz 7

2 50 V 700 Hz 7

3 500 V 700 Hz 7

4 500 V 700 Hz 7

DC V

1 5V DC 7

2 50 V DC 7

3 500 V DC 7

4 500 V DC 7

Ohms

1

12

0 Ohms 16

2 500 Ohms 16

3 5k Ohms 7

Ohms

4 50k Ohms 7

5 500k Ohms 7

6 5M Ohms 73

7 30M ohms 13

AC uA

1 500 uA 700 Hz 7

2 5000 uA 700 Hz 7

DC uA

1 500 uA DC 16

2 5000 uA DC 7

AC mA

1 50 mA 700 Hz 7

2 400 mA 700 Hz 7

DC mA

1 50 mA DC 16

2 400 mA DC 7


2. Zero volts and ohms must use the same calibrator and test leads as all other volt and ohm cal

points.

Do not bypass the calibrator with a shorting bar for the zero volts or ohms step.




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25

Table 5. Calibration Inputs (cont.)


AC A

1 5 A 700 Hz 7

2 5 A 700 Hz 7

DC A

1 5 A DC 16

2 5 A DC 7


2. Zero volts and ohms must use the same calibrator and test leads as all other volt and ohm cal

points.

Do not bypass the calibrator with a shorting bar for the zero volt or ohm step.



Remote Interface

You can perform semi-automated calibration with the remote interface using MET/CALsoftware.

Temperature Calibration

Required equipment:

Fluke 87/89-IV, 187/189 Service Software, Fluke P/N 676152

Infrared Serial Cable Kit, Fluke P/N 1590638

IBM compatible PC

Fluke 80T-150U with accuracy certified to +0.2 C

Fluke 8060A Digital Multimeter

Note

The following procedure is only required if the Meter has been repaired byreplacing one of the following components: A/D, U4, Reference JunctionSensor, U100 or EEPROM, U10.

Setup

Prior to beginning the procedure, turn the rotary switch OFF. Let the Meter stabilize in aconstant ambient temperature for 30 minutes. This allows the internal reference junctionsensor and input terminals to stabilize to the same temperature.

Connect the IR Serial Cable to the serial com port of the PC. Install the 87/89-IV,187/189 Service Software.


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26

Procedure

While the rotary switch is in the OFF position, insert the certified 80T-150 probe into theMeters COM terminal (same temperature as reference junction). Make sure the probe tipmakes firm contact with the bottom of the terminal. Measure and record the COMterminal temperature in units of 1/100 C. Do not convert this number to Fahrenheit,

even if the Meter is using the Fahrenheit scale for its display output.Turn the rotary switch to the temperature position. It does not matter whether the Meteris in calibration mode. On the Service Software menu screen, clickC Ref. Junction.Enter the measured temperature value in the text box and clickOK. This sends therecorded reference junction temperature to the Meter through the IR Serial Cable.

Although the temperature calibration is not yet complete, it is safe at this point to turnthe Meter off if the need arises. Doing so will not invalidate the previous steps.

To complete the temperature calibration, the DC mV function must be calibrated.

After DC mV calibration is complete:

1. Turn the rotary switch to the temperature position. Put the Meter in calibration modeby pressing the recessed button on the back of the Meter.

The secondary display, which normally shows the required input, displays zero. Inthis case, no input is required.

2. Press the UP button.

This sends the calculated temperature constants to EEPROM, and completes thetemperature calibration.

3. Continue calibrating the other functions, or turn the rotary switch to the OFFposition to exit calibration.

Re-Programming Serial Number or Model Number

When the U10 EEPROM is replaced, you must also reenter the serial number and model

number for the Meter. Do this as follows:

1. Connect the IR Serial Cable to the serial com port of the PC. Install 87/89-IV,187/189 Service Software (Fluke P/N 676152).

2. Turn the Meter rotary switch to any function.

3. On the Service Software menu screen, clickEEPROM. Enter the serial number fromthe back of the Meter in the text box and clickOK. To enter the model number, clickYes or No in the model menu box.


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True RMS MultimeterParts and Accessories

27

Parts and AccessoriesReplacement parts and accessories are listed in Table 6 and identified in Figure 7 by thereference designator.

Table 6. Replacement Parts and Accessories

Description

Reference

Designators Part Number Qty

Access Door, Battery / Fuse MP14 1589387 1

Tilt-Stand MP8 659026 1

Accessory Mount MP9 658424 1

WFuse, 0.44 A (44/100 A, 440 mA),

1000 V, FAST

F1 943121 1

WFuse, 11 A,1000 V FAST F2 803293 1

Battery, 1.5 V, 0-15 mA, AA Alkaline H8, H9, H10, H11 376756 4Fasteners, Battery / Fuse Access Door H12, H13 948609 2

Screws, Phillip-Head H4, H5, H6, H7 832246 4

AC70A Alligator Clip (Black) MP38 738047 1

AC70A Alligator Clip (Red) MP39 738120 1

TL71 Right-Angle Test Lead Set MP34 802980 1

LCD 4.5 Digit Multiplexed DS1 688181 1

Connector, Elastomeric, LCD to PWB1

MP30, MP31 690883 2

Getting Started Manual (TM1-TM5) See Note Below2

5

CD-ROM (Contains Users Manual) (TM6) 1576992 1

W

To ensure safety, use exact replacement only.

1. Order replacement connectors separately when ordering a replacement LCD.

2. Getting Started Manual PNs: English=1547486; French, German, Italian, Dutch=1555282; Danish, Finnish,

Norwegian, Swedish=1555307; French, Spanish, Portuguese=1555294; Simplified Chinese, Traditional Chinese,

Korean, Japanese,Thai=1555318


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F2

H4

MP34

MP39

MP38

H5

H7

H13MP14

MP8

H12

MP9 H6

H8,9,10,11

F1

MP31

MP30

DS1

Documents

Fluke_calibration_manual-187_189_cmeng0100